The Facepiece,breathing Equipment, cataloged under National Stock Number 4240-01-249-3173, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Mine Safety Appliances Company. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-249-3173 |
| Primary Part Number | 808259 |
| Item Name | Facepiece,breathing Equipment |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| Criticality Code Justification | FEAT |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 808259 PRIMARY | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| 466488 | 5/9 Secondary reference Mine Safety Appliances Company |
NSN 4240-01-249-3173 is a Facepiece,breathing Equipment, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-249-3173 has 1 manufacturer part number on file: 808259 (Mine Safety Appliances Company).
2 possible matches (shared part number, not a government interchangeability claim): 1650-01-663-4598, 5935-01-734-2837. Verify interchangeability with system specifications before substitution.
Key specifications for 808259: Criticality Code Justification: FEAT; Special Features: HALF MASK; LARGE; BLACK; SOLE SOURCE REQUIRED BY STATUTE 6.302; End Item Identification: MSA MODEL COMFO II RESPIRATOR. 1 specification is documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 4240-01-249-3173 has DEMIL Code F. Demilitarization may be required before disposal or transfer to non-military entities.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.